5116 Prelim P2 Fuhua 09

Class

Register Number

Candidate Name _______________________________________ FUHUA SECONDARY SCHOOL Secondary Four Express/ Five Normal Academic Preliminary Examination 2009 Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary

Science (PHYSICS)

5116/2

PAPER 2 Additional materials: Answer paper Protractor

DATE

17 September 2009

TIME

0750 h - 0905 h

DURATION

1 hour 15 minutes

INSTRUCTIONS TO CANDIDATES Write your name, class and register number in the spaces at the top of this page and on all separate answer paper used. Section A

Answer all questions. Write your answers in the spaces provided on the question paper. Section B.

Answer two questions. Write your answers on the separate answer paper provided. At the end of the examination, fasten all separate answer paper securely. INFORMATION FOR CANDIDATES Take g = 10 N/kg, unless otherwise stated. The number of marks is given in brackets [ ] at the end of each question or part question. PARENT'S SIGNATURE

FOR EXAMINER'S USE

65 Setter

Mr Sreenivasan

Class Highest Mark: Lowest Mark: Average Mark: Standard This Question Paper consists of 10 printed pages.

SECTION A (45 Marks) Answer all the questions in the spaces provided 1. A block of metal of density 2700 kg/m3 and mass 10 kg weighs 16 N on the moon. a) Calculate the gravitational field strength on the moon?

[2] b) Explain what “gravitational field strength” means. _________________________________________________________________ _______________________________________________________________ [1] c) The gravitational field strength on earth is greater than on the moon. Explain if the object will be heavier or lighter on earth. _________________________________________________________________ _______________________________________________________________ [1] d) i. Calculate the volume of the block.

[1] ii. State with a reason if the density of the metal block on earth will be different from that on the moon. _________________________________________________________________ _______________________________________________________________ [1] 2. Fig 2.1 below shows two cars pulling a boulder of mass 1000 kg

car 3000 N 50o 40o 4000 N

car

Fig 2.1 2

a) Using a scale diagram, determine the resultant force acting on the boulder. Scale: ____________________

[4] b) If boulder was initially at rest, with what speed will it move after 3 seconds as a result of the resultant force you calculated in part a) above.

[2]

velocity / m/s

3. Fig 3.1 is a graph showing how the velocity of a car starting from rest and traveling for 15 seconds varies with time. 12 11 10 9 8 7 6 5 4 3 2 1 0 0

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16

time / s

Fig 3.1

3

a) How far does the car travel as its velocity changes from i) 0 m/s to 4 m/s?

[1] ii) 4 m/s to 8 m/s?

[1] b) Calculate the acceleration of the car.

[2] c) What is the resultant force acting on the car if its mass is 1100 kg?

[1] 4. A roller coaster is pulled up to a height of 50 m by an engine using a chain. The roller coaster when fully loaded has a mass of 2000 kg. The roller coaster then slides down. Roller coaster

rollercoaster slides down distance along track 70 m 50 m

25 m/s

Fig 4.1

4

a) What is the potential energy gained by the roller coaster when it is at a height of 50 m?

[2] b) What is the force exerted by the engine to pull the roller coaster up the track if the distance along the track is 70 m?

[2] c) The roller coaster then slides down a steep track making a loud rumbling and screeching noise. It reaches a speed of 25 m/s at the bottom of the track. Calculate the kinetic energy of the roller coaster.

[2] d) According to the law of conservation of energy, energy cannot be destroyed. Explain why there is a difference between the initial gravitational potential energy and the final kinetic energy of roller coaster. ________________________________________________________________ [1] 5. Electromagnetic waves have many uses. For each of the following state their use. a) Microwave _______________________________________________________________ [1] b) Infrared radiation _______________________________________________________________ [1] c) Gamma rays ________________________________________________________________ [1]

5

6. Evaporation and boiling are processes that refer to a change in state from liquid to gas. a) State two differences between the two processes _________________________________________________________________ _______________________________________________________________ [2] b) There is hot tea in a cup. Two methods were used to cool down the tea so it can be drunk. i) Method one: The hot tea was poured into a large saucer. It cooled down quickly so that it could be consumed almost immediately. Explain in terms of evaporation how cooling takes place. _______________________________________________________________ _______________________________________________________________ ____________________________________________________________ [2] ii) Method two: Ice cubes were put into the tea. Explain in terms of convection currents how the ice floating in the tea cools it. _______________________________________________________________ _______________________________________________________________ _____________________________________________________________ [2] 7. Figure 7. 1 below shows an object in front of a thin converging lens.

F

F

Fig 7.1 a) Draw rays to determine the position and height of the image.

[2]

b) State with a reason if the image formed will be real. ________________________________________________________________ [1] 6

8. The diagram shows a metallic sphere hanging from an insulating thread. A positively charged rod is brought near the metallic sphere. a) Show the charge distribution on the sphere. Insulating thread + + + + +

X Metallic sphere

Fig 8.1 [1] b) Between the charged rod and the sphere is an electric field. i) What is an electric field? _________________________________________________________________ _______________________________________________________________ [1] ii) Show the direction of force on a negatively charged particle at X.

[1]

9. Figure 9.1 below shows four resistors in a circuit. Each resistor has a resistance of 3 Ω. A current of 3 A is flowing from the battery. 3A 3Ω

3Ω

3Ω

3Ω Fig 9.1

a) Calculate the charge flowing through the circuit in 30 seconds.

[1] b) Calculate the combined resistance.

[2] 7

c) Calculate the e.m.f of the battery if it has negligible internal resistance.

[1] d) Calculate the current flowing through one of the 3 Ω resistors.

[2]

SECTION B (20 MARKS) Answer any two questions on foolscap paper 10. The diagram below shows a diving board found at swimming pools. The board is pivoted at P. It has a length of 2.4 m and weighs 300 N. A man of weight 800 N stands at a distance of 1.9 m from the pivot as shown. A spring holds the board in place.

0.5 m

1.9 m

spring pivot 300 N

1.2 m

800 N

Fig 10.1 a) i. Calculate the moment due to the weight of the man and the board about P.

[3]

ii. If the distance between the spring and the pivot is 0.5 m, what is the force exerted by the spring to hold the board and the man in equilibrium?

[2]

iii. Draw an arrow to show the direction of the force exerted by the spring

[1]

b) A child of mass 35 kg stands on the board at a distance of 0.5 m behind the pivot, directly above the spring. 8

i. Calculate the moment due to the child

[2]

ii. Explain what would happen to the force exerted by the spring and determine the new force

[2]

11. Figure 11.1 below shows a solenoid connected to a battery and switch.

S

N Fig 11.1

a) i. A magnet was placed with its north-seeking pole near one end of the solenoid. Describe what will happen to the magnet when the switch is closed. ii. Draw the magnetic lines of force between the magnet and the solenoid.

[2] [1]

b) Figure 11.2 below shows the cross section of a drawer. A solenoid is used as part of a device to operate a hidden lock in the drawer.

Iron Bolt Screw

Drawer

Metal contacts

Spring locks the drawer by pulling bolt up Brass sleeve to hold iron bolt vertically so that it can slide up and down Solenoid

Fig 11.2 The iron bolt is held in place by the spring and moves down when any conductor is placed on the contacts completing the electric circuit containing the solenoid. i. Explain why the iron bolt moves down when a current flows in the solenoid.

[2]

ii. Explain why the lock would still work even if the current direction in the solenoid is reversed with the iron rod but might not when a steel rod is used.

[3] 9

iii. If the energy in the battery is used up while the rod is in the locked position, suggest a way to open the lock.

[2]

12. Light is a transverse wave. a) What is a transverse wave?

[1]

b) A series of light wavefronts are incident on an air glass boundary as shown. The section of the wave front in the glass travel slower compared to those in the air.

Air

Glass

Fig 12.1 i.

Explain the term wavefront.

[1]

ii. What happens to the wavelength of the light if its frequency remains the same.[1] iii. Measure the angle of incidence and the angle refraction.

[2]

iv. Calculate the refractive index of glass.

[2]

c) The glass has a light ray incident as shown below.

50o

Fig 12.2 i. Determine the critical angle from the values you calculated in part b. Copy the semicircular glass block and complete the ray diagram on your foolscap paper. [2] ii. State an application of the effect seen in part c) i, above for practical use.

[1]

10